(svn r16268) -Fix (r9876): When callback 2E returns an amount of 0, do not transport 1 unit to the station.

2 files changed, 5 insertions, 0 deletions

diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 9289fa39a..23ac09e7b 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -2973,6 +2973,9 @@ void FindStationsAroundTiles(TileIndex tile, int w_prod, int h_prod, StationList
 
 uint MoveGoodsToStation(TileIndex tile, int w, int h, CargoID type, uint amount)
 {
+	/* Return if nothing to do. Also the rounding below fails for 0. */
+	if (amount == 0) return 0;
+
 	Station *st1 = NULL;   // Station with best rating
 	Station *st2 = NULL;   // Second best station
 	uint best_rating1 = 0; // rating of st1
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 9b46343db..200f650a7 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -455,6 +455,8 @@ static void TileLoop_Town(TileIndex tile)
 			if (cargo == CT_INVALID) continue;
 
 			uint amt = GB(callback, 0, 8);
+			if (amt == 0) continue;
+
 			uint moved = MoveGoodsToStation(tile, 1, 1, cargo, amt);
 
 			const CargoSpec *cs = GetCargo(cargo);